When camping with smaller children, put a bar of soap in one leg of a pair of pantyhose and tie a towel to the other leg.
Secure pantyhose to a tree at your campsite (we knot the legs around the tree). Hang a hot-water shower next to the soap, and you have a handy washing station that will eliminate the need to walk to the restrooms to clean messy hands and faces.
Note: Hanging soap is not bear-friendly.